Elements of the Fourth faced multiple Clans on Tukayyid, the bulk most notably assisting the First against Clan Ghost Bear, losing units both to combat losses and the Com Guards' reorganization in 3053. Four Divisions was deemed enough even in the face of increased Word of Blake activity in the wake of the formation of the so-called Chaos March.

After the beginning of the Jihad the ComGuard Armies were stretched too thin. To counteract this, the 7th-12th Armies were disbanded and used to reinforce the 1st-6th Armies. This gave each of the newly-reinforced Armies a full six Divisions. The 4th Army was one of the formations affected, receiving new reinforcements. The new 4th Army was supposed to be stationed in the Capellan Confederation, but political realities have kept them in the Federated Suns.[1]

As part of Operation SCOUR the Fourth Army was assigned to the Free Worlds League front as a part of Group III under the field command of KhanSantin West of Clan Nova Cat. In 3077 they invaded Wasat alongside the 20th Marik Militia and Clan Nova Cat's Alpha Galaxy. This allowed the rescue of the 7th Pesht Regulars and the remainder of Group II, who had encountered far more robust and intricate defences on Wasat than had originally been anticipated.[2] They later liberated the world of Kalidasa, and briefly came under fire from resistance fighters on that world.[3] Early 3078 found the Fourth Army on Chertan, where they took serious losses from the two Chertan Protectorate Militia Divisions, but ultimately the Fourth took the world.[4]

Little more than a skeleton force after Chertan, the 4th Army was formally disbanded in 3078 with its surviving elements folded into Stone's Revenants by General Belle Lee. [5]